AIIMS2019Chemistry-Chemical Bonding

AIIMS 2019 Chemistry Molecular Orbital Theory Assertion Reason Question

Type: Assertion Reason-conceptual-Medium-Class 11

Assertion: H₂⁺ and ions have the same bond order. Reason: H₂⁺ is less stable than H₂⁻.

A

If both assertion and reason are true and reason is the correct explanation of assertion.

B

If both assertion and reason are true but reason is not the correct explanation of assertion.

C

If assertion is true but reason is false.

D

If both assertion and reason are false.

Correct Answer

Option C

Detailed Explanation

The assertion that H₂⁺ and H₂⁻ have the same bond order is true because both species have a bond order of 0.5, calculated from their molecular orbital configurations. However, the reason that H₂⁺ is less stable than H₂⁻ is false; in fact, H₂⁺ is less stable than H₂ due to its positive charge and lower electron count, while H₂⁻ is more stable than H₂ due to the extra electron. Options A and B are incorrect because they imply that the reason correctly explains the assertion, which it does not, and option D is incorrect as the assertion is true.

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